This question surfaces occasionally. I am sent queries sometimes, especially when a creation speaker runs into someone with a background in physics and/or that creationist is challenged as to the plausibility of the model I presented in my book, Starlight Time and the New Physics.
In the book I developed an idea of a cosmological model based on Moshe Carmeli’s Cosmological Relativity theory. I used Carmeli’s cosmology to create a biblical creationist model for the origin of the Universe, with a timeline that includes the 6 days of Genesis creation beginning about 6000 years ago. I took parts of Carmeli’s big bang cosmology and added biblically based hypotheses (and speculations) to make it conform to Scripture.
The main text of the book outlines a sketch of how history the Universe would have unfolded if the cosmology and resulting cosmogony were a true for our Universe. The theme is that new physics is needed. The appendices 1-5 of the book are there to show the reader that the underlying theory (Carmeli’s theory) can explain what we observe in the Universe, where new physics was added, and thus what we build on that should also be valid. Appendix 6 is where I theorised about a Creation scenario. That is totally my own work, even though I extrapolated from Carmeli.
That means it is no longer Carmeli’s cosmology but a sort of hybrid cosmology. Carmeli only constructed a 4 dimensional (4D) space-velocity model for the Universe. He never found a full 5D model for the whole Universe, which might be used to construct a history close to the Creation epoch. I theorised on a new model–call it the Hartnett-Carmeli model if you like–which is 5D. I added the time dimension to Carmeli’s space and velocity dimensions, to create a linearised 5 dimensional model, something like an extension of special relativity but in 5 dimensions. That is shown in appendix 6. I then used that, making additional assumptions, to explore the idea of rapid time-dilation during Creation. The additional assumptions involved direct intervention by the Creator as might be expected during Creation. If the resulting scenario is a description of the true history of the Universe then that also provides a solution to the starlight-travel-time problem.
I do not claim it is the answer but if God did something like I describe it could provide us with an understanding of it. It is a possible solution and I admit there are several potential areas where the solution may be found. Adding new physics may be a simple way to avoid many fudge factors in cosmology but it does mean adding a new dimension that is very hard to even conceptualise.